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E. DREVET. INTERNAL COMBUSTION ENGINE.

APPLICATION FILED MAR-24, I920. 1,378,333. P tented May 17, 1921.

3 3 SHEETS-SHEET I- a4 a4 43 45 z /2 M 6 /17 I e/Wvr 35 E. Dre we? E.DREVET. INTERNAL COMBUSTION ENGINE.

v APPuCATmM FAILED MAR 24, 1920. .1 ,378,333.

Patented May 17, 1921.

3 SHEETS-SHEET 2- 2 4 25 //7 van for 53 E. Dre V27" M 7 A/for'ney E.DREVETIv INTERNAL COMBUSTION ENGINE.

APPLICATION FILED MAR. 24, I920.

Patented May 17, 1921.

3 SHEETSSHEET 3- /n yen for E. Dre I/ef M404 flfforney UNITED STATESEMILE DBEVET, OF MONTREAL, QUEBEC, CANADA.

INTERNAL-COMBUSTION ENGINE.

Specification of Letters Patent.

Patented May 17, 1921.

Application filed. March 24, 1920. Serial No. 368,399.

T 0 all whom it may concern Be it known that I, EMILE Dnnvn'r, a Frenchcitizen, residing at No. 58 1 St. Timothee street, in the city ofMontreal, in the Province of Quebec, in the Dominion of Canada, haveinvented certain new and useful Improvements in Internal-CombustionEngines; and 1 do hereby declare that the following is a full, clear,and exact description of the same.

The present invention relates to improvements in internal combustionengines and the main object of the invention is to eliminate thevibration and increase the efficiency.

A further object of the invention is to provide a gas engine of thischaracter that will be cheap of construction with easy access to thecylinders or other parts.

The invention will be better understood with the aid of the accompanyingdrawings, in which Figure 1 is a top view of the invention.

Fig. 2 is a vertical sectional view on line 2-2 of Fig. 1.

Fig. 3 is a cross sectional view on line 3-3 of Fig. 1.

Fig. 4 is a horizontal sectional View on line 44: of Fig. 2.

Fig. 5 is a top view of the base, crank shaft and other operating parts;the cylinders and pistons having been removed.

Fig. 6 is an inner view of the head casing of the engine disclosing thegas inlets and outlets.

Like numerals of reference indicate corresponding parts in each drawing.

Referring to the drawings 1 and 2 are the cylinders, preferably disposedin horizontal and parallel arrangement in relation to one another, eachof said cylinders being open-ended and provided intermediate thereofwith a semi-circular opening 3 which leads to a passage 1, and 5 is ahead casing provided over said cylinders 1 and 2, and suitably securedthereto. Said cylinders are preferably provided with a water-jacket 6which is adapted to commu nicate with the water-jacket 7 provided in thehead casing 5, by means of the openings 8.

Each cylinder 1 and 2 is provided with a hole 9 in which is suitablysecured the spark plug 10. Adjacent each end of said cylinders 1 and 2is provided an opening 11 which is adapted to communicate with the base12 on which is rigidly secured said cylinders. The open ends of saidcylinders are preferably cut at an angle and are closed by the plates18, said plates being provided with an embossment 14 in order to allowfor the free action of the piston rods.

The head casing 5 is provided with the gas inlet passage 15 whichcommunicates with the passage 1 in the cylinders 1 and 2 by means of aports 16, and 17 is a main gas inlet which is adapted to communicatewith the carbureter 18 by means of the gas pipe 19. The said head 5 isalso provided with the exhaust passage 20 which communicates with thepassage 4 by means of the ports 21, and 22 is the main exhaust outletwhich is adapted to communicate with the exhaust pipe 23.

The inlet ports 16 are each preferably providedwith a verticallyoperating valve 24: that is suit-ably held in position by the springs 25which are mounted on the stems 26 which project through said head 5 insuitable openings. The outlet or exhaust ports 21 are also provided withvalves 27 mounted on the stems 28 which project through the head 5 andare held in position by the springs 29.

In each of said cylinders 1 and 2 are movably mounted two pistons 30 and31 that are adapted to operate simultaneously in opposite directions, intheir outstroke movement and operate in converging directions in theirinstroke movement. The said pistons are so adjusted that in theirinstroke they will come in alinement with the opening 3 provided in saidcylinders. Each of said pistions 30 and 81 are provided with a pistonrod 32 which is pivotally connected thereto, said piston rod beingpivotally connected at its other end to the crank arm 33 which projectsthrough said openings 11 and is rigidly mounted on crossed shaft 84,said shaft being journaled in suitable bearings 35 mounted in base 12.36 is a crank arm rigidly mounted on the cross shaft 3 1 at one end andis connected to the crank shaft 37 at its other end by means of theconnecting link 38.

The engine now described is one of the four-cycle type and the pistonswork in pairs. For instance, the pistons 30 working together and thepistons 31 working together in opposite directions so as tocounter-balance the other.

The crank shaft 37 is journaled in suitable bearings 39 and projectsthrough said base 12. On one end of said crank shaft is mounted thefly-wheel 40, and on its opposite end is mounted a sprocket 41 which isadapted to co-act with the gear 42 mounted on one end of the cam-shaft43 which also projects through the base 12.

The cam-shaft 43 is provided with a plurality of cams 44, the number ofcams corresponding to the number of valves, each of said cams beingadapted to contact with a head 45 provided on the lower end of thevertical stems 46 which project into said base 12 and are connected attheir upper end to the cranks 47, said cranks being fulcrumedintermediate thereof on the brackets 48, and are connected at theirother end to the stems 26 and 28 operating the valves 24 and 27. Saidcams are so adjusted as to operate the valves 24 and 27 at suitableintervals.

The operation of the pistons 30 and 31 is readily understood from thedrawings particularly Figs. 2 and 4 and it is clear that the vibrationwill be eliminated to a great extent owing to the balancing type of theengine, and further a most important feature of this invention residesin the fact that the pistons can easily be removed from each sidewithout having to completely knock down the engine. For instance, whenthis engine is mounted on an automobile chassis, if anything happens toit, access can readily be had to the cylinders by removing the plates 13on each side, thus saving considerable time and expense; while inordinary gas engines access to the cylinder is rather diflicult and alengthy operation.

Another important feature of the present invention resides in the factthat the crank shaft will receive an even and simultaneous pressure oneach side, counter-balancing the vibrations caused by the movement ofone piston by the other and further lessening the tear and wear on theengine, thus eliminating ovally-formed cylinders, as thepiston rods arepractically always kept in a parallel line in relation to the walls ofthe cylinder.

Another important feature is that an engine of this character will berather low on the chassis thus lowering the center of gravity andproviding for better equilibrium. Further, although there are fourpistons, only two spark plugs and four valves will be required, thuslessening a lot of trouble "caused by a plurality of these elements,which are susceptible of causing improper ignition or allowinginsufiicient quantity of gas, etc.

It will very easily be seen from the foregoing description, that a gasengine of this character will be quickly knocked down by removing thepin connections between the piston rods 32 and the cranks 83 and by removing the bolts securing the cylinders to the base 12.

What I claim as my invention is 1. An internal combustion enginecomprising a base; a horizontal cylinder having open ends mounted onsaid base; remov able plates adapted to close said open ends; an openingon one side of said cylinder in which is secured a spark plug; a centralopening in said cylinder; a head casing mounted on said cylinder; aninlet port in said head communicating with said central opening in saidcylinder; an exhaust port in said head communicating with said centralopening in said cylinder; a vertically operable valve in said inlet andsaid exhaust ports; pistons movably mounted in said cylinder adapted tooperate in opposite directions; a crank shaft suitably journaled in saidbase; means to connect said pistons to said crank shaft; a camshaftmounted across said base; cam-members mounted on said shaft; means toactuate said shaft; and a vertical connecting rod connected to each ofsaid valves; said connecting rods being adapted to contact with each ofsaid canimembers; substantially as described.

2. An internal combustion engine comprising a base, horizontal cylindershaving open ends mounted on said base at suitable intervals from oneanother; removable plates adapted to close said open ends; an opening onone side of each of said cylinders in which is secured a spark plu acentral opening in each of said cylinders enlarged on the outer side ofsaid cylinders to form a recess; a head casing mounted across saidcylinders; inlet ports in said head communicating with said recesses ineach of said cylinders; exhaust ports in said head communicating withsaid recesses in said cylinders; vertically operable 'alves in saidinlet and exhaust ports; pistons movably mounted in said cylindersadapted to operate in opposite directions; a crank shaft suitablyjcurnaled in said base; means to connect said crank shaft to saidpistons; cam-shaft journaled across said base; cam-- members mounted onsaid cam-shaft; means to actuate said warn-shaft; a plurality ofvertical connecting rods projecting in be tween said cylinders on eachside thereolconnected to each of said valves, said connecting rods beingadapted to contact with each of said cam-members, substantially asdescribed.

Signed at Montreal, Quebec, Canada, this 1st day of March, 1910.

EMILE DREVET.

lVitnesses M. DENYS, C. PATENAUDE.

